larray.Array.isin¶

Array.isin(self, test_values, assume_unique=False, invert=False)[source]¶

Computes whether each element of this array is in test_values. Returns a boolean array of the same shape as this array that is True where the array element is in test_values and False otherwise.

Parameters:

test_values : array_like or set: The values against which to test each element of this array. If test_values is not a 1D array, it will be converted to one.
assume_unique : bool, optional: If True, this array and test_values are both assumed to be unique, which can speed up the calculation. Defaults to False.
invert : bool, optional: If True, the values in the returned array are inverted, as if calculating element not in test_values. Defaults to False. isin(a, b, invert=True) is equivalent to (but faster than) ~isin(a, b).

Returns:

Array: boolean array of the same shape as this array that is True where the array element is in test_values and False otherwise.

Examples

>>> arr = ndtest((2, 3))
>>> arr
a\b  b0  b1  b2
 a0   0   1   2
 a1   3   4   5
>>> arr.isin([1, 5, 7])
a\b     b0     b1     b2
 a0  False   True  False
 a1  False  False   True
>>> arr[arr.isin([1, 5, 7])]
a_b  a0_b1  a1_b2
         1      5